Battery management circuit, vehicle, and battery management method

Abstract

A battery management circuit, a vehicle, and a battery management method. The circuit comprises: a compressor, wherein two ends of the compressor are respectively connected to a first end of a first battery module by means of a front electric control plug of a battery pack and a second end of a second battery module by means of a rear electric control plug of the battery pack; a first relay, wherein a first end of the first relay is connected to a first end of the second battery module by means of the rear electric control plug, and a second end of the first relay is connected to a first end of the compressor; a second relay, wherein a first end of the second relay is connected to a second end of the first battery module by means of the rear electric control plug, and a second end of the second relay is connected to a second end of the compressor; and a controller, wherein the controller is used for: when thermal runaway occurs in the first battery module, controlling the first relay to be closed, so that the second battery module continuously supplies power to the compressor; and when thermal runaway occurs in the second battery module, controlling the second relay to be closed, so that the first battery module continuously supplies power to the compressor.

Description

Battery management circuit, vehicle and battery management method

[0001] The present application claims priority to the Chinese patent application No. 202411125836.4, filed on August 16, 2024, and entitled "Battery management circuit, vehicle and battery management method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery management, in particular to a battery management circuit, a vehicle and a battery management method. BACKGROUND

[0003] With the development of new energy, the technical field of new energy vehicles has gradually matured. New energy vehicles usually supply power to vehicles through battery packs. In the process of supplying power to vehicles by battery packs, the batteries in the battery packs usually need to be thermally managed to avoid thermal runaway events of the batteries that cause the batteries to be unable to supply power normally and continuously.

[0004] In the conventional technology, some vehicle architecture thermal management systems cool the liquid-cooled battery pack by cooling liquid. The coolant of the direct-cooling battery pack is provided by a compressor, and the compressor is driven by a power battery.

[0005] However, at least the problem of ineffective cooling of the battery pack exists in the implementation process of the conventional technology. SUMMARY

[0006] The purpose of the present application is to provide a battery management circuit, a vehicle and a battery management method to achieve the effect of ensuring effective cooling of the battery pack.

[0007] In a first aspect, the embodiments of the present application provide a battery management circuit applied to a battery pack, the battery pack comprising a first battery group and a second battery group; the circuit comprising:

[0008] a compressor, two ends of the compressor being connected to a first end of the first battery group through a front electric control plug of the battery pack and a second end of the second battery group through a rear electric control plug of the battery pack;

[0009] a first relay, a first end of the first relay being connected to the first end of the second battery group through the rear electric control plug, and a second end of the first relay being connected to a first end of the compressor;

[0010] a second relay, a first end of the second relay being connected to the second end of the first battery group through the rear electric control plug, and a second end of the second relay being connected to a second end of the compressor;

[0011] The controller is configured to control the first relay to close to enable the second battery pack to continuously supply power to the compressor through the first relay when the first battery pack experiences thermal runaway, and control the second relay to close to enable the first battery pack to continuously supply power to the compressor through the second relay when the second battery pack experiences thermal runaway.

[0012] In a possible implementation, the circuit further comprises:

[0013] The first voltage boosting module has a first end connected to a second end of the first relay and a second end connected to a first end of the compressor, and is configured to boost voltage of the second battery pack when the first battery pack experiences thermal runaway.

[0014] The second voltage boosting module has a first end connected to a second end of the second relay and a second end connected to a second end of the compressor, and is configured to boost voltage of the first battery pack when the first battery pack experiences thermal runaway.

[0015] In a possible implementation, the first relay and the second relay are both voltage boosting relays.

[0016] In a possible implementation, the first end of the first relay is connected to the first end of the second relay and connected to a second end of the first battery pack and a first end of the second battery pack through the rear electric control plug-in.

[0017] In a possible implementation, the circuit further comprises a third relay.

[0018] The first end of the first relay and the first end of the second relay are connected to the first end of the third relay through the rear electric control plug-in.

[0019] The second end of the third relay is connected to the second end of the first battery pack and the first end of the second battery pack, respectively.

[0020] In a possible implementation, the circuit further comprises:

[0021] The front electric control relay has a first end connected to the first end of the compressor and a second end connected to the first end of the first battery pack.

[0022] The rear electric control relay has a first end connected to the second end of the compressor and a second end connected to the second end of the second battery pack.

[0023] In a possible implementation, the circuit further comprises:

[0024] The main positive relay has a first end connected to the first end of the compressor through the front electric control plug-in and a second end connected to the first end of the first battery pack.

[0025] The first end of the main negative relay is connected to the second end of the compressor through the rear electric control plug, and the second end of the main negative relay is connected to the second end of the second battery pack.

[0026] In a possible implementation, the circuit further comprises a boost relay and a pre-charge circuit.

[0027] The first end of the boost relay is connected to the first end of the main positive relay and the first end of the pre-charge circuit respectively through the front electric control plug, and is connected to the first end of the compressor.

[0028] The second end of the boost relay is connected to the second end of the main positive relay and the second end of the pre-charge circuit respectively, and is connected to the first end of the first battery pack.

[0029] In a second aspect, an embodiment of the present application provides a vehicle, comprising:

[0030] a vehicle body;

[0031] the battery management circuit as described above is arranged in the vehicle body.

[0032] In a third aspect, an embodiment of the present application provides a battery management method, applied to the battery management circuit as described above, and the method comprises:

[0033] When the first battery pack occurs thermal runaway, the first relay is controlled to be closed, so that the second battery pack continuously supplies power to the compressor through the first relay;

[0034] When the first battery pack occurs thermal runaway, the second relay is controlled to be closed, so that the first battery pack continuously supplies power to the compressor through the second relay.

[0035] In a possible implementation, the method further comprises:

[0036] According to the voltage of the first battery pack or the voltage of the second battery pack, the operating power of the compressor is adjusted to enable the compressor to operate normally.

[0037] Compared with the prior art, the battery management circuit, the vehicle and the battery management method provided by the embodiments of the present application can keep the other battery unit continue to be used when thermal runaway occurs in one of the battery units, so that the compressor can continue to work normally, and the compressor can continuously provide refrigerant for the cold plate of the battery pack, and the battery pack with thermal runaway can be effectively cooled. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a structural schematic diagram of a whole vehicle architecture management system provided by the present application;

[0039] Fig. 2 is a structural schematic diagram of a battery management circuit provided by the present application;

[0040] Fig. 3 is a structural schematic diagram of a battery management circuit provided by the present application;

[0041] Fig. 4 is a structural schematic diagram of a battery management circuit provided by the present application;

[0042] Fig. 5 is a structural schematic diagram of a battery management circuit provided by the present application;

[0043] Fig. 6 is a flowchart of a battery management method provided by the present application;

[0044] Fig. 7 is a structural schematic diagram of a battery management device provided by the present application;

[0045] Fig. 8 is a structural schematic diagram of a controller provided by the present application.

[0046] Reference signs: 110: battery system; 120: liquid cooling; 130: electronic pump; 140: heat exchanger; 150: expansion water pot; 160: evaporator; 170: compression device; 180: condenser; 190: throttling element; 100: direct current cold plate; 210: first battery pack; 220: second battery pack; 230: compressor; 240: first relay; 250: second relay; 260: first boost module; 270: second boost module; 280: third relay; 510: front electric control relay; 520: rear electric control relay; 530: main positive relay; 540: main negative relay; 550: boost relay; 560: pre-charge relay; 570: pre-charge resistor; 580: fast-charge positive relay; 590: direct current charging fuse; 600: fast-charge negative relay; 610: front electric control fuse; 620: voltage division relay; K1: front electric control plug-in; K2: rear electric control plug-in; K3: direct current charging plug-in. DETAILED DESCRIPTION

[0047] Figure 1 is a whole vehicle architecture management system provided by the present application. As shown in Figure 1, (a) is a battery management system under a liquid cooling architecture, including a battery system 110, a liquid cooling 120, an electronic pump 130, a heat exchanger 140, an expansion water tank 150, an evaporator 160, a compression device 170, a condenser 180, and a throttling element 190. (b) is a battery management system under a direct cooling architecture, including a battery system 110, a direct cooling plate 100, an evaporator 160, a compression device 170, and a condenser 180. When a single cell thermal runaway occurs in the battery pack, the whole vehicle under the liquid cooling architecture can continuously input circulating coolant to the battery pack cooling plate to cool the battery pack cells and slow down the severity of the thermal runaway reaction. However, when the battery pack under the direct cooling architecture experiences thermal runaway, the total positive relay is disconnected, the battery cells cannot continue to discharge, the compressor 230 cannot continue to provide refrigerant to the battery pack cooling plate, and the battery pack cannot be effectively cooled.

[0048] In combination with the above scenarios, in the conventional technology, there is at least the technical problem that the battery pack experiencing thermal runaway cannot be effectively cooled.

[0049] The battery management circuit provided by the present application can keep the other battery cells continue to use when one of the battery cells experiences thermal runaway, so that the compressor 230 can continue to work normally to provide refrigerant to the battery pack cooling plate continuously. The technical problem of how to effectively cool the battery pack experiencing thermal runaway is solved.

[0050] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0051] Figure 2 is a structural schematic diagram of a battery management circuit provided by the present application. As shown in Figure 2, the circuit is applied to a battery pack, which includes a first battery group 210 and a second battery group 220. The circuit includes:

[0052] A compressor 230, the two ends of the compressor 230 are connected to the first end of the first battery group 210 through the front electronic control plug of the battery pack and the second end of the second battery group 220 through the rear electronic control plug of the battery pack.

[0053] The compressor 230 can be a compressor of the vehicle, can be used to provide cold air for the cab of the vehicle, and can also provide refrigerant for the battery pack to keep the battery pack at a suitable working temperature. The front electric control plug-in can be a plug-in used by the battery pack of the vehicle to provide current voltage for the front drive. The rear electric control plug-in can be a plug-in used by the battery pack of the vehicle to provide current voltage for the front drive. The front electric control plug-in and the rear electric control plug-in can both be provided on the battery pack.

[0054] Optionally, the first battery pack 210 and the second battery pack 220 can form a series structure in the battery pack, that is, the negative electrode of the first battery pack 210 can be connected to the positive electrode of the second battery pack 220, or the positive electrode of the first battery pack 210 can be connected to the negative electrode of the second battery pack 220. In actual application, the first end of the first battery pack 210 is a positive electrode, and the second end is a negative electrode; the first end of the second battery pack 220 is a positive electrode, and the second end is a negative electrode.

[0055] Exemplarily, the second end of the first battery pack 210 is connected to the first end of the second battery pack 220, and the two ends of the compressor 230 can be connected to the first end of the first battery pack 210 through the front electric control plug-in of the battery pack and connected to the second end of the second battery pack 220 through the rear electric control plug-in of the battery pack, to form a loop in which the first battery pack 210 and the second battery pack 220 are connected in series to supply power to the compressor 230. Under normal power supply conditions, the first battery pack 210 and the second battery pack 220 supply power to the compressor 230 at the same time.

[0056] The first relay 240 has a first end connected to the first end of the second battery pack 220 through the rear electric control plug-in, and a second end connected to the first end of the compressor 230.

[0057] The first relay 240 can be a relay used for on-off control between the first end of the second battery pack 220 and the first end of the compressor 230.

[0058] The second relay 250 has a first end connected to the second end of the first battery pack 210 through the rear electric control plug-in, and a second end connected to the second end of the compressor 230.

[0059] The second relay 250 can be a relay used for on-off control between the second end of the first battery pack 210 and the second end of the compressor 230.

[0060] Exemplarily, the first end of the compressor 230 is connected to the first end of the second battery pack 220 through the first relay 240, and a first backup power supply circuit between the second battery pack 220, the first relay 240 and the compressor 230 can be formed. The second end of the compressor 230 is connected to the second end of the first battery pack 210 through the second relay 250, and a second backup power supply circuit between the first battery pack 210, the second relay 250 and the compressor 230 can be formed.

[0061] In actual application, the first relay 240 and the second relay 250 can be disconnected in normal power supply, that is, the first backup power supply circuit and the second backup power supply circuit are controlled to be disconnected.

[0062] The controller is configured to control the first relay 240 to be closed when the first battery pack 210 is in thermal runaway, so that the second battery pack 220 continuously supplies power to the compressor 230 through the first relay 240; and control the second relay 250 to be closed when the second battery pack 220 is in thermal runaway, so that the first battery pack 210 continuously supplies power to the compressor 230 through the second relay 250.

[0063] Exemplarily, the controller can be connected to the first relay 240 and the second relay 250 respectively, and the controller can be configured to control the on-off of the circuit for normally supplying power to the compressor 230. Here, the normal power supply refers to the power supply when the battery pack is not in thermal runaway.

[0064] Specifically, if the first battery pack 210 is in thermal runaway, the controller can disconnect the connection between the first end of the first battery pack 210 and the first end of the compressor 230, and the controller can control the first relay 240 to be closed, so that the first backup power supply circuit is turned on, and the compressor 230 can be continuously powered by the second battery pack 220, so that the compressor 230 can continuously work normally, and the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, so as to effectively cool the first battery pack 210 in thermal runaway.

[0065] If the second battery pack 220 is in thermal runaway, the controller can disconnect the connection between the second end of the second battery pack 220 and the second end of the compressor 230, and the controller can control the second relay 250 to be closed, so that the second backup power supply circuit is turned on, and the compressor 230 can be continuously powered by the first battery pack 210, so that the compressor 230 can continuously work normally, and the compressor 230 can continuously provide refrigerant to the cold plate of the battery pack, so as to effectively cool the second battery pack 220 in thermal runaway.

[0066] It can be understood that the above structure provided by the embodiment realizes the loop connection between the first battery pack 210, the second battery pack 220 and the compressor 230 by using the front electric control plug-in and the rear electric control plug-in. The front electric control plug-in and the rear electric control plug-in can be the front and rear electric control corresponding battery pack plug-ins of the four-wheel drive vehicle. That is, the embodiment provided by the present application can be applied to the four-wheel drive vehicle.

[0067] Compared with the prior art, the battery management circuit provided in the embodiment can keep the other battery cells continue to be used when thermal runaway occurs in one of the battery cells, so that the compressor 230 can continue to work normally, so that the compressor 230 can continuously provide refrigerant for the cold plate of the battery pack, and the battery pack thermal runaway battery can be effectively cooled.

[0068] In one exemplary embodiment, FIG. 3 is a schematic structural diagram of the battery management circuit provided by the present application. As shown in FIG. 3, the embodiment is based on the embodiment of FIG. 2, and the battery management circuit is described in detail. The circuit further comprises:

[0069] The first boost module 260 has a first end connected to the second end of the first relay 240 and a second end connected to the first end of the compressor 230. The first boost module 260 is used to boost the voltage of the second battery pack 220 when the first battery pack 210 experiences thermal runaway.

[0070] The second boost module 270 has a first end connected to the second end of the second relay 250 and a second end connected to the second end of the compressor 230. The second boost module 270 is used to boost the voltage of the first battery pack 210 when the first battery pack 210 experiences thermal runaway.

[0071] The first boost module 260 can be used to boost the voltage of the second battery pack 220 to meet the rated voltage (or starting voltage) of the compressor 230. The second boost module 270 can be used to boost the voltage provided by the first battery pack 210 to meet the rated voltage (or starting voltage) of the compressor 230.

[0072] Exemplarily, the first relay 240 can be connected to the first end of the compressor 230 through the first boost module 260; and the second relay 250 can be connected to the second end of the compressor 230 through the second boost module 270.

[0073] In actual application, the first end of the first relay 240 is connected to the first end of the second battery pack 220 through the rear electronic control plug, the second end of the first relay 240 is connected to the first end of the first voltage boosting module 260, the second end of the first voltage boosting module 260 is connected to the first end of the compressor 230, and the second end of the compressor 230 is connected to the second end of the second battery pack 220 through the rear electronic control plug, so as to form a loop in which the second battery pack 220 supplies power to the compressor 230.

[0074] The first end of the second relay 250 is connected to the second end of the first battery pack 210 through the rear electronic control plug, the second end of the second relay 250 is connected to the first end of the second voltage boosting module 270, the second end of the second voltage boosting module 270 is connected to the second end of the compressor 230, and the first end of the compressor 230 is connected to the first end of the first battery pack 210 through the rear electronic control plug, so as to form a loop in which the first battery pack 210 supplies power to the compressor 230.

[0075] Specifically, if the first battery pack 210 is in thermal runaway, the controller can disconnect the connection between the first end of the first battery pack 210 and the first end of the compressor 230, and the controller can control the first relay 240 to be closed, so that the voltage provided by the second battery pack 220 is boosted by the first voltage boosting module 260 to reach the rated voltage of the compressor 230, and the compressor 230 is continuously powered, so that the compressor 230 can continuously provide refrigerant for the cold plate of the battery pack, and effectively cool the first battery pack 210 in thermal runaway.

[0076] If the second battery pack 220 is in thermal runaway, the controller can disconnect the connection between the second end of the second battery pack 220 and the second end of the compressor 230, and the controller can control the second relay 250 to be closed, so that the voltage provided by the first battery pack 210 is boosted by the second voltage boosting module 270 to reach the rated voltage of the compressor 230, and the compressor 230 is continuously powered, so that the compressor 230 can continuously provide refrigerant for the cold plate of the battery pack, and effectively cool the second battery pack 220 in thermal runaway.

[0077] It can be understood that through the above structure, the rated voltage can be ensured to be provided for the compressor 230 when the battery is in thermal runaway, the working power of the compressor 230 is maintained, the battery in thermal runaway can be cooled, and the stability of the battery pack management is improved.

[0078] Optionally, the first relay 240 and the second relay 250 are voltage boosting relays.

[0079] In actual application, the structure can not additionally set the first voltage boosting module 260 and the second voltage boosting module 270 to boost the voltage, and the first relay 240 and the second relay 250 can be directly set as voltage boosting relays to directly boost the voltage of the first battery pack 210 and the voltage of the second battery pack 220, so that the voltage input to the compressor 230 meets the rated voltage.

[0080] Optionally, the voltage can also be pulled up to the rated voltage of the compressor 230 when half of the battery pack is in thermal runaway by adjusting the variable voltage coil related circuit in the compressor 230.

[0081] In the embodiment, the direct voltage boosting by the voltage boosting relay can maintain the rated power output of the compressor and save the cost of setting the voltage boosting module.

[0082] In one exemplary embodiment, FIG. 4 is a structure schematic diagram of a battery management circuit provided by the present application, and FIG. 5 is a structure schematic diagram of a battery management circuit provided by the present application. As shown in FIG. 4 or FIG. 5, the embodiment is based on the embodiment of FIG. 2, and the battery management circuit is described in detail. The circuit can have the following connection relationship:

[0083] The first end of the first relay 240 is connected to the first end of the second relay 250 and connected to the second end of the first battery pack 210 and the first end of the second battery pack 220 through the rear electronic control plug K2.

[0084] For example, the first end of the first relay 240 can be connected to the first end of the second relay 250, and the two connected first ends are connected to the second end of the first battery pack 210 and the first end of the second battery pack 220 through the rear electronic control plug K2. In this way, the first end of the first relay 240 and the first end of the second relay 250 are connected first, and then connected to the second end of the first battery pack 210 and the first end of the second battery pack 220, which can reduce the use of the plug of the rear electronic control plug K2 and save the component space.

[0085] Optionally, as shown in FIG. 4, the circuit further comprises a third relay 280;

[0086] The connected first end of the first relay 240 and the first end of the second relay 250 are connected to the first end of the third relay 280 through the rear electronic control plug K2;

[0087] The second end of the third relay 280 is connected to the second end of the first battery pack 210 and the first end of the second battery pack 220, respectively.

[0088] The third relay 280 can be a relay for controlling the on-off of the standby power supply circuit of the compressor 230.

[0089] For example, the third relay 280 can be arranged in the battery pack. After the first end of the first relay 240 and the second relay 250 are connected, the first end of the third relay 280 can be connected to the rear electric control plug-in K2, and the second end of the third relay 280 can be connected between the second end of the first battery pack 210 and the first end of the second battery pack 220. In this way, the third relay 280 can be used to control the on-off of the circuit in which the first relay 240 and the second relay 250 are arranged.

[0090] Specifically, when neither the first battery pack 210 nor the second battery pack 220 has thermal runaway, and the first battery pack 210 and the second battery pack 220 normally supply power to the compressor 230, the controller can control the third relay 280 to be open. When the first battery pack 210 or the second battery pack 220 has thermal runaway, the controller can control the third relay 280 to be closed to continuously supply power to the compressor 230 by the battery without thermal runaway.

[0091] In this embodiment, the arrangement and structure of the third relay 280 can ensure the correctness of the on-off of the circuit, so that the battery management circuit can normally and effectively supply power to the compressor 230.

[0092] In one example embodiment, FIG. 5 is a structural schematic diagram of a battery management circuit provided by the present application. As shown in FIG. 5, the embodiment is based on the embodiment of FIG. 2, and the battery management circuit is described in detail. The circuit further includes:

[0093] The front electric control relay 510 connects the first end of the compressor 230 to the first end of the first battery pack 210.

[0094] The rear electric control relay 520 connects the second end of the compressor 230 to the second end of the second battery pack 220.

[0095] The front electric control relay 510 can be a relay arranged in the front electric control of the vehicle. The rear electric control relay 520 can be a relay arranged in the rear electric control of the vehicle. The first relay 240 and the second relay 250 can also be arranged in the rear electric control.

[0096] Exemplarily, the first end of the front electric control relay 510 can be connected to the first end of the compressor 230, and the second end of the front electric control relay 510 can be connected to the first end of the first battery pack 210; the first end of the rear electric control relay 520 can be connected to the second end of the compressor 230, and the second end of the rear electric control relay 520 can be connected to the second end of the second battery pack 220. Through the structure, the compressor 230 is connected to the first battery pack 210 and the second battery pack 220 through the front electric control relay 510 and the rear electric control relay 520, which can enable the first battery pack 210 and the second battery pack 220 to control the on-off of the power supply circuit of the compressor 230 through the front electric control relay 510 and the rear electric control relay 520.

[0097] Specifically, when neither the first battery pack 210 nor the second battery pack 220 has thermal runaway, the controller can control the front electric control relay 510 and the rear electric control relay 520 to remain closed. When the first battery pack 210 has thermal runaway, the controller can control the front electric control relay 510 to be disconnected, so that the first battery pack 210 no longer continues to discharge, and the controller controls the rear electric control relay 520 to remain closed, so that the second battery pack 220 continues to supply power to the compressor 230. When the second battery pack 220 has thermal runaway, the controller can control the rear electric control relay 520 to be disconnected, so that the second battery pack 220 no longer continues to discharge, and the controller controls the front electric control relay 510 to remain closed, so that the first battery pack 210 continues to supply power to the compressor 230.

[0098] In the embodiment, the control of the battery management circuit is realized through the front electric control relay 510 and the rear electric control relay 520, which can effectively block the thermal runaway battery from continuing to discharge, and can keep the battery without thermal runaway to continue to supply power to the compressor 230, so that the compressor 230 can cool the battery with thermal runaway, and ensure the stability of the battery pack.

[0099] Optionally, as shown in FIG. 5, the circuit further comprises:

[0100] a main positive relay 530, the first end of the main positive relay 530 is connected to the first end of the compressor 230 through the front electric control plug-in K1, and the second end of the main positive relay 530 is connected to the first end of the first battery pack 210;

[0101] a main negative relay 540, the first end of the main negative relay 540 is connected to the second end of the compressor 230 through the rear electric control plug-in K2, and the second end of the main negative relay 540 is connected to the second end of the second battery pack 220.

[0102] The main positive relay 530 can be arranged in the battery pack and can be used to control the on-off of the circuit between the first battery pack 210 and the compressor 230. The main negative relay 540 can be arranged in the battery pack and can be used to control the on-off of the circuit between the second battery pack 220 and the compressor 230.

[0103] For example, the main positive relay 530 is arranged in the battery pack, and the first end of the main positive relay 530 is connected to the first end of the compressor 230 through the front electronic control plug K1, and the second end of the main positive relay 530 is connected to the first end of the first battery pack 210. The main negative relay 540 is also arranged in the battery pack, and the first end of the main negative relay 540 is connected to the first end of the compressor 230 through the rear electronic control plug K2, and the second end of the main positive relay 530 is connected to the first end of the first battery pack 210. Through this structure, the compressor 230 can be connected to the first battery pack 210 and the second battery pack 220 through the main positive relay 530 and the main negative relay 540 respectively, so that the on-off of the power supply circuit of the compressor 230 by the first battery pack 210 and the second battery pack 220 can be controlled through the main positive relay 530 and the main negative relay 540.

[0104] Specifically, when neither the first battery pack 210 nor the second battery pack 220 has thermal runaway, the controller can control the main positive relay 530 and the main negative relay 540 to remain closed. When the first battery pack 210 has thermal runaway, the controller can control the main positive relay 530 to be opened, so that the first battery pack 210 no longer continues to discharge, and the controller controls the main negative relay 540 to remain closed, so that the second battery pack 220 continues to supply power to the compressor 230. When the second battery pack 220 has thermal runaway, the controller can control the main negative relay 540 to be opened, so that the second battery pack 220 no longer continues to discharge, and the controller controls the main positive relay 530 to remain closed, so that the first battery pack 210 continues to supply power to the compressor 230.

[0105] In this embodiment, the control of the battery management circuit is realized by the main positive relay 530 and the main negative relay 540 arranged in the battery pack, which can effectively block the thermal runaway battery from continuing to discharge, and can keep the battery without thermal runaway to continue to supply power to the compressor 230, so that the compressor 230 can cool the battery with thermal runaway, and ensure the stability of the battery pack.

[0106] Optionally, as shown in FIG. 5, the circuit further includes a boost relay 550 and a pre-charge circuit;

[0107] The first end of the boost relay 550 is connected to the first end of the main positive relay 530 and the first end of the pre-charge circuit respectively through the front electronic control plug K1, and is connected to the first end of the compressor 230;

[0108] The second end of the boost relay 550 is connected to the second end of the main positive relay 530 and the second end of the pre-charge circuit, and to the first end of the first battery pack 210.

[0109] The boost relay 550 can be used to boost the voltage provided by the battery pack. The pre-charge circuit can include a pre-charge relay 560 and a pre-charge resistor 570.

[0110] The two ends of the boost relay 550 are connected to the two ends of the boost relay 550, and the first end of the boost relay 550 can be connected to the first end of the main positive relay 530 through the front control plug K1. The two ends of the pre-charge circuit are also connected to the two ends of the boost relay 550, and the first end of the pre-charge circuit can be connected to the first end of the main positive relay 530 through the front control plug K1. It can be understood that the front control plug K1 can be a multi-core plug.

[0111] The pre-charge resistor 570 of the pre-charge circuit is connected to the first end of the boost relay 550 and the first end of the main positive relay 530, the second end of the pre-charge resistor 570 is connected to the first end of the pre-charge relay 560, and the first end of the pre-charge relay 560 is connected to the second end of the boost relay 550 and the second end of the main positive relay 530.

[0112] In practical applications, the battery voltage of the battery pack can be boosted by the boost relay 550 to meet the requirement of the rated voltage of the compressor 230, and the voltage between the battery pack and the compressor 230 can be balanced by the pre-charge circuit, so that the stability of the voltage provided by the battery pack can be ensured.

[0113] In one exemplary embodiment, FIG. 5 is a structural schematic diagram of the battery management circuit provided by the present application, as shown in FIG. 5, the battery management circuit is described in detail, which includes:

[0114] The negative electrode of the first battery pack 210 is connected to the positive electrode of the second battery pack 220 through the voltage division relay 620. The first end of the compressor 230 is connected to the front control plug K1 of the battery pack through the front control relay 510, and the second end of the compressor 230 is connected to the rear control plug K2 of the battery pack through the rear control relay 520.

[0115] The first end of the first relay 240 is connected to the first end of the second relay 250, and is connected to the first end of the third relay 280 through the rear control plug K2. The second end of the third relay 280 is connected to the second end of the first battery pack 210 and the first end of the second battery pack 220. The second end of the first relay 240 is connected to the first end of the compressor 230, and the second end of the second relay 250 is connected to the second end of the compressor 230.

[0116] The battery pack further comprises: a first end of the main positive relay 530 connected to the front electric control connector K1, a first end of the boost relay 550 connected to the front electric control connector K1, a first end of the pre-charge resistor 570 connected to the front electric control connector K1, and a second end of the pre-charge resistor 570 connected to a first end of the pre-charge relay 560; a second end of the main positive relay 530, a second end of the boost relay 550, and a second end of the pre-charge relay 560 are connected together and connected to a positive electrode of the first battery pack 210 through a high-voltage control unit (HVCU) of the battery pack. A first end of the main negative relay 540 is connected to the rear electric control connector K2 through a high-voltage supervising unit (HVSU) of the battery pack.

[0117] The battery pack further comprises a direct current charging connector K3, a first end of the fast charging positive relay 580 is connected to the direct current charging connector K3, a second end of the fast charging positive relay 580 is connected to a first end of the fast charging fuse 590, and a second end of the fast charging fuse 590 is connected to a first end of the main positive relay 530. A first end of the fast charging negative relay 600 is connected to the direct current charging connector K3, and a second end of the fast charging negative relay 600 is connected to a first end of the main negative relay 540 and the rear electric control connector K2 through the high-voltage supervising unit HVSU, respectively. The front electric control connector K1 and the rear electric control connector K2 can be connected through the front electric control fuse 610.

[0118] Specifically, when a cell in the cell stack of the first battery pack 210 has thermal runaway, the main positive relay 530 is opened (at this time, the boost relay 550 and the pre-charge relay 560 are both in an open state), the upper half of the cell cannot continue to discharge, the lower half of the cell of the second battery pack 220 discharges through the rear electric control connector, the rear electric control relay 520 is closed, the first relay 240 is closed, the second relay 250 is opened, and the compressor 230 is driven to work. When a cell in the cell stack of the second battery pack 220 has thermal runaway, the main negative relay 540 is opened, the cell of the first battery pack 210 in the upper half discharges through the main positive circuit and the front electric control connector, the front electric control relay 510 is closed, the rear electric control relay 520 is opened, the first relay 240 is opened, the second relay 250 is closed, and the compressor 230 is driven to work.

[0119] In the embodiment, an additional circuit is added in the battery pack distribution box to divide the whole battery pack into two parts. When thermal runaway occurs in the single battery cell on one side, the vehicle receives the thermal runaway alarm signal of the battery pack, transmits the information to the battery pack BMS, and the battery cell on the other side is continuously powered by the relay of the additional circuit, the whole pack power plug-in (front and rear electronic control plug-in), and the relay switch to maintain the normal operation or increase the power of the compressor, so that the refrigerant circulating to the battery pack battery cell can be cooled. When the above-mentioned thermal event occurs, half of the battery will not continue to discharge, which means that the voltage output by the whole pack through the double electronic control connector will be halved. At this time, the voltage of the first relay or the second relay is adjusted by the related voltage conversion circuit to pull up to the rated voltage (or starting voltage) of the compressor to maintain the normal operation of the compressor, so that the battery pack can be effectively cooled.

[0120] In one example embodiment, the present application provides a vehicle, comprising:

[0121] a vehicle body;

[0122] a battery management circuit as described above, arranged on the vehicle body.

[0123] Optionally, the vehicle can be an electric vehicle, and the vehicle body is provided with a battery management circuit as described above to provide various required electric energy for the vehicle.

[0124] In practical application, through the vehicle provided with the above-mentioned battery management circuit, the battery pack of the vehicle can be effectively cooled, and the normal use of the vehicle is ensured.

[0125] In one example embodiment, Fig. 6 is a flowchart of the battery management method provided by the present application. As shown in Fig. 6, the method is applied to the battery management circuit as described above, and the method comprises:

[0126] S601, when thermal runaway occurs in the first battery pack, controlling the first relay to close to make the second battery pack continuously supply power to the compressor through the first relay;

[0127] S602, when thermal runaway occurs in the first battery pack, controlling the second relay to close to make the first battery pack continuously supply power to the compressor through the second relay.

[0128] For example, if thermal runaway occurs in the first battery pack, the controller can disconnect the connection between the first end of the first battery pack and the first end of the compressor, and the controller can control the first relay to close to make the first backup power supply circuit as described above conductive, so that the second battery pack can continuously supply power to the compressor, and the compressor can continuously work normally to continuously provide refrigerant to the cold plate of the battery pack, and effectively cool the first battery pack with thermal runaway.

[0129] If the second battery pack is in thermal runaway, the controller can disconnect the connection between the second end of the second battery pack and the second end of the compressor, and the controller can control the second relay to close to make the second backup power supply circuit conduct, so that the compressor can be continuously powered by the first battery pack, the compressor can continue to work normally, and the compressor can continuously provide refrigerant for the cold plate of the battery pack to effectively cool the second battery pack in thermal runaway.

[0130] In actual application, through the above method, when half of the battery is in thermal runaway, the other half of the battery can continuously power the compressor, so that the compressor can provide refrigerant to cool the battery pack in thermal runaway, thereby improving the effectiveness of cooling the battery pack.

[0131] Optionally, as shown in FIG. 6, the method further includes:

[0132] S603, adjusting the operating power of the compressor according to the voltage of the first battery pack or the voltage of the second battery pack, so that the compressor operates normally.

[0133] For example, when the first battery pack is in thermal runaway, the operating power of the compressor can be adjusted according to the voltage of the second battery pack to reduce the voltage required for the operation of the compressor. When the second battery pack is in thermal runaway, the operating power of the compressor can be adjusted according to the voltage of the first battery pack to reduce the voltage required for the operation of the compressor.

[0134] In actual application, through the above method, the setting of the voltage boosting module or the adjustment of the compressor circuit can be reduced, and the cost of circuit setting can be reduced under the condition that the compressor operates normally.

[0135] FIG. 7 is a structural schematic diagram of a battery management device provided by the present application. As shown in FIG. 7, the battery management device 70 provided by the present embodiment includes:

[0136] The first relay control module 701 is configured to control the first relay to close when the first battery pack is in thermal runaway, so that the second battery pack continuously supplies power to the compressor through the first relay.

[0137] The second relay control module 702 is configured to control the second relay to close when the first battery pack is in thermal runaway, so that the first battery pack continuously supplies power to the compressor through the second relay.

[0138] In a possible implementation, the device further includes a power adjustment module. The power adjustment module is configured to adjust the operating power of the compressor according to the voltage of the first battery pack or the voltage of the second battery pack, so that the compressor operates normally.

[0139] The battery management device provided in the embodiment can execute the method provided in the method embodiment, and has similar implementation principles and technical effects, which will not be repeated here.

[0140] FIG. 8 is a structural schematic diagram of a controller provided in the application. As shown in FIG. 8, the electronic device 80 provided in the embodiment includes at least one processor 801 and a memory 802. Optionally, the device 80 further includes a communication component 803. The processor 801, the memory 802 and the communication component 803 are connected through a bus 804.

[0141] In the specific implementation process, the at least one processor 801 executes the computer execution instructions stored in the memory 802, so that the at least one processor 801 executes the method described above.

[0142] The specific implementation process of the processor 801 can refer to the method embodiments described above, which has similar implementation principles and technical effects, and will not be repeated here.

[0143] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC) and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor and the like. The steps of the method disclosed in the application can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0144] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), for example, at least one disk memory.

[0145] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus and the like. For the convenience of representation, the bus in the drawings of the application does not limit only one bus or one type of bus.

[0146] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the method described above.

[0147] The application further provides a computer readable storage medium, wherein computer execution instructions are stored in the computer readable storage medium, and when a processor executes the computer execution instructions, the method described above is implemented.

[0148] The readable storage medium described above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0149] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0150] The division of units is only a logical function division, and in actual implementation, there can be another division mode, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0151] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on a plurality of network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0152] In addition, the functional units in each embodiment of the application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0153] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0154] It can be understood by those skilled in the art that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0155] Finally, it should be noted that: those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A battery management circuit, wherein, The application is applied to a battery pack, the battery pack comprises a first battery pack (210) and a second battery pack (220); the circuit comprises: a compressor (230), two ends of the compressor (230) are connected to a first end of the first battery pack (210) through a front electric control plug of the battery pack and a second end of the second battery pack (220) through a rear electric control plug of the battery pack respectively; a first relay (240), a first end of the first relay (240) is connected to a first end of the second battery pack (220) through the rear electric control plug, and a second end of the first relay (240) is connected to a first end of the compressor (230); a second relay (250), a first end of the second relay (250) is connected to a second end of the first battery pack (210) through the rear electric control plug, and a second end of the second relay (250) is connected to a second end of the compressor (230); a controller, when thermal runaway occurs in the first battery pack (210), the controller controls the first relay (240) to be closed, so that the second battery pack (220) continuously supplies power to the compressor (230) through the first relay (240); when thermal runaway occurs in the second battery pack (220), the controller controls the second relay (250) to be closed, so that the first battery pack (210) continuously supplies power to the compressor (230) through the second relay (250).

2. The battery management circuit of claim 1, wherein, The circuit further comprises: a first voltage boosting module (260), a first end of the first voltage boosting module (260) is connected to a second end of the first relay (240), and a second end of the first voltage boosting module (260) is connected to a first end of the compressor (230); the first voltage boosting module (260) is used for boosting the voltage of the second battery pack (220) when thermal runaway occurs in the first battery pack (210); a second voltage boosting module (270), a first end of the second voltage boosting module (270) is connected to a second end of the second relay (250), and a second end of the second voltage boosting module (270) is connected to a second end of the compressor (230); the second voltage boosting module (270) is used for boosting the voltage of the first battery pack (210) when thermal runaway occurs in the first battery pack (210).

3. The battery management circuit of claim 1 or 2, wherein, The first relay (240) and the second relay (250) are both voltage boosting relays (550).

4. The battery management circuit of any one of claims 1-3, wherein, A first end of the first relay (240) is connected to a first end of the second relay (250), and is connected to a second end of the first battery pack (210) and a first end of the second battery pack (220) through the rear electric control plug.

5. The battery management circuit of claim 4, wherein, The circuit further comprises a third relay (280); The first end of the first relay (240) and the first end of the second relay (250) are connected to a first end of the third relay (280) through the rear electric control plug; The second ends of the third relays (280) are connected to the second end of the first battery pack (210) and the first end of the second battery pack (220), respectively.

6. The battery management circuit of any one of claims 1-5, wherein, The circuit further comprises: a front electrically controlled relay (510), the first end of the compressor (230) being connected to the first end of the first battery pack (210) through the front electrically controlled relay (510); a rear electrically controlled relay (520), the second end of the compressor (230) being connected to the second end of the second battery pack (220) through the rear electrically controlled relay (520).

7. The battery management circuit of any one of claims 1-6, wherein, The circuit further comprises: a main positive relay (530), the first end of the main positive relay (530) being connected to the first end of the compressor (230) through the front electrically controlled plug-in, and the second end of the main positive relay (530) being connected to the first end of the first battery pack (210); a main negative relay (540), the first end of the main negative relay (540) being connected to the second end of the compressor (230) through the rear electrically controlled plug-in, and the second end of the main negative relay (540) being connected to the second end of the second battery pack (220).

8. The battery management circuit of claim 7, wherein, The circuit further comprises a boost relay (550) and a pre-charge circuit; the first end of the boost relay (550) being connected to the first end of the main positive relay (530) and the first end of the pre-charge circuit through the front electrically controlled plug-in, and being connected to the first end of the compressor (230); the second end of the boost relay (550) being connected to the second end of the main positive relay (530) and the second end of the pre-charge circuit, and being connected to the first end of the first battery pack (210).

9. A vehicle, wherein, It comprises: a vehicle body; the battery management circuit according to any one of claims 1 to 8 is arranged in the vehicle body.

10. A battery management method, wherein, The method is applied to the battery management circuit according to any one of claims 1 to 8, and comprises: when the first battery pack (210) occurs thermal runaway, the first relay (240) is controlled to be closed, so that the second battery pack (220) continuously supplies power to the compressor (230) through the first relay (240); when the first battery pack (210) occurs thermal runaway, the second relay (250) is controlled to be closed, so that the first battery pack (210) continuously supplies power to the compressor (230) through the second relay (250).

11. The battery management method of claim 10, wherein, The method further comprises: According to the voltage of the first battery pack (210) or the voltage of the second battery pack (220), the operating power of the compressor (230) is adjusted to make the compressor (230) operate normally.

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